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                <h1 id="服务端渲染技术NUXT"><a href="#服务端渲染技术NUXT" class="headerlink" title="服务端渲染技术NUXT"></a>服务端渲染技术NUXT</h1><h2 id="1-简介"><a href="#1-简介" class="headerlink" title="1.简介"></a>1.简介</h2><p>服务端渲染又称SSR (Server Side Render)是在服务端完成页面的内容，而不是在客户端通过AJAX获取数据。</p>
<p>服务器端渲染(SSR)的优势主要在于：<strong>更好的 SEO</strong>，由于搜索引擎爬虫抓取工具可以直接查看完全渲染的页面。</p>
<span id="more"></span>
<p><img src="https://pluto-1300780100.cos.ap-nanjing.myqcloud.com/img/image-20210128131643490.png" alt="image-20210128131643490"></p>
<p>Nuxt.js 是一个基于 Vue.js 的轻量级应用框架,可用来创建服务端渲染 (SSR) 应用,也可充当静态站点引擎生成静态站点应用,具有优雅的代码结构分层和热加载等特性。</p>
<p>官网网站：<a target="_blank" rel="noopener" href="https://zh.nuxtjs.org/">https://zh.nuxtjs.org/</a></p>
<h2 id="2-安装初始化"><a href="#2-安装初始化" class="headerlink" title="2.安装初始化"></a>2.安装初始化</h2><p>（1）下载压缩包：<a target="_blank" rel="noopener" href="https://github.com/nuxt-community/starter-template/archive/master.zip">https://github.com/nuxt-community/starter-template/archive/master.zip</a></p>
<p>（2）将template中的内容复制到vscode工作区。</p>
<p>（3）修改package.json：name、description、author（<strong>必须修改这里，否则项目无法安装</strong>）</p>
<pre class="line-numbers language-json" data-language="json"><code class="language-json">"name": "guli",
"version": "1.0.0",
"description": "谷粒学院前台网站",
"author": "Helen &lt;55317332@qq.com&gt;",<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
<p>（4）修改nuxt.config.js（这里的设置最后会显示在页面标题栏和meta数据中）</p>
<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript">head<span class="token operator">:</span> <span class="token punctuation">{</span>
    title<span class="token operator">:</span> <span class="token string">'谷粒学院 - Java视频|HTML5视频|前端视频|Python视频|大数据视频-自学拿1万+月薪的IT在线视频课程，谷粉力挺，老学员为你推荐'</span><span class="token punctuation">,</span>
    meta<span class="token operator">:</span> <span class="token punctuation">[</span>
      <span class="token punctuation">{</span> charset<span class="token operator">:</span> <span class="token string">'utf-8'</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
      <span class="token punctuation">{</span> name<span class="token operator">:</span> <span class="token string">'viewport'</span><span class="token punctuation">,</span> content<span class="token operator">:</span> <span class="token string">'width=device-width, initial-scale=1'</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
      <span class="token punctuation">{</span> hid<span class="token operator">:</span> <span class="token string">'keywords'</span><span class="token punctuation">,</span> name<span class="token operator">:</span> <span class="token string">'keywords'</span><span class="token punctuation">,</span> content<span class="token operator">:</span> <span class="token string">'谷粒学院,IT在线视频教程,Java视频,HTML5视频,前端视频,Python视频,大数据视频'</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
      <span class="token punctuation">{</span> hid<span class="token operator">:</span> <span class="token string">'description'</span><span class="token punctuation">,</span> name<span class="token operator">:</span> <span class="token string">'description'</span><span class="token punctuation">,</span> content<span class="token operator">:</span> <span class="token string">'谷粒学院是国内领先的IT在线视频学习平台、职业教育平台。截止目前,谷粒学院线上、线下学习人次数以万计！会同上百个知名开发团队联合制定的Java、HTML5前端、大数据、Python等视频课程，被广大学习者及IT工程师誉为：业界最适合自学、代码量最大、案例最多、实战性最强、技术最前沿的IT系列视频课程！'</span> <span class="token punctuation">}</span>
    <span class="token punctuation">]</span><span class="token punctuation">,</span>
    link<span class="token operator">:</span> <span class="token punctuation">[</span>
      <span class="token punctuation">{</span> rel<span class="token operator">:</span> <span class="token string">'icon'</span><span class="token punctuation">,</span> type<span class="token operator">:</span> <span class="token string">'image/x-icon'</span><span class="token punctuation">,</span> href<span class="token operator">:</span> <span class="token string">'/favicon.ico'</span> <span class="token punctuation">}</span>
    <span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>（5）安装依赖：npm install</p>
<p>（6）测试运行：npm run dev</p>
<h2 id="3-NUXT目录结构"><a href="#3-NUXT目录结构" class="headerlink" title="3.NUXT目录结构"></a>3.NUXT目录结构</h2><p>（1）资源目录 assets</p>
<p> 用于组织未编译的静态资源如 LESS、SASS 或 JavaScript。</p>
<p>（2）组件目录 components</p>
<p>用于组织应用的 Vue.js 组件。Nuxt.js 不会扩展增强该目录下 Vue.js 组件，即这些组件不会像页面组件那样有 asyncData 方法的特性。</p>
<p>（3）布局目录 layouts</p>
<p>用于组织应用的布局组件。</p>
<p>（4）页面目录 pages</p>
<p>用于组织应用的路由及视图。Nuxt.js 框架读取该目录下所有的 .vue 文件并自动生成对应的路由配置。</p>
<p>（5）插件目录 plugins</p>
<p>用于组织那些需要在 根vue.js应用 实例化之前需要运行的 Javascript 插件。</p>
<p>（6）nuxt.config.js 文件</p>
<p>nuxt.config.js 文件用于组织Nuxt.js 应用的个性化配置，以便覆盖默认配置。</p>
<p><img src="https://pluto-1300780100.cos.ap-nanjing.myqcloud.com/img/image-20210128133815623.png" alt="image-20210128133815623"></p>
<h2 id="4-Nuxt路由"><a href="#4-Nuxt路由" class="headerlink" title="4.Nuxt路由"></a>4.Nuxt路由</h2><p><img src="https://pluto-1300780100.cos.ap-nanjing.myqcloud.com/img/image-20210128133928018.png" alt="image-20210128133928018"></p>
<h1 id="Springboot中缓存的添加"><a href="#Springboot中缓存的添加" class="headerlink" title="Springboot中缓存的添加"></a>Springboot中缓存的添加</h1><h2 id="1-Redis介绍"><a href="#1-Redis介绍" class="headerlink" title="1.Redis介绍"></a>1.Redis介绍</h2><p>Redis是当前比较热门的NOSQL系统之一，它是一个开源的使用ANSI c语言编写的key-value存储系统（区别于MySQL的二维表格的形式存储。）。和Memcache类似，但很大程度补偿了Memcache的不足。和Memcache一样，Redis数据都是缓存在计算机内存中，不同的是，Memcache只能将数据缓存到内存中，无法自动定期写入硬盘，这就表示，一断电或重启，内存清空，数据丢失。所以Memcache的应用场景适用于缓存无需持久化的数据。而Redis不同的是它会周期性的把更新的数据写入磁盘或者把修改操作写入追加的记录文件，实现数据的持久化。</p>
<p>由于首页数据变化不是很频繁，而且首页访问量相对较大，所以我们有必要把首页接口数据缓存到redis缓存中，减少数据库压力和提高访问速度。</p>
<h2 id="2-项目集成Redis"><a href="#2-项目集成Redis" class="headerlink" title="2.项目集成Redis"></a>2.项目集成Redis</h2><p>添加依赖</p>
<pre class="line-numbers language-markup" data-language="markup"><code class="language-markup"><span class="token comment">&lt;!-- redis --&gt;</span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">&gt;</span></span>org.springframework.boot<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">&gt;</span></span>spring-boot-starter-data-redis<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">&gt;</span></span>

<span class="token comment">&lt;!-- spring2.X集成redis所需common-pool2--&gt;</span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">&gt;</span></span>org.apache.commons<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">&gt;</span></span>commons-pool2<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>version</span><span class="token punctuation">&gt;</span></span>2.6.0<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>version</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>添加redis配置类<strong>RedisConfig.java</strong></p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">@EnableCaching
@Configuration
public class RedisConfig extends CachingConfigurerSupport {

    @Bean
    public RedisTemplate&lt;String, Object&gt; redisTemplate(RedisConnectionFactory factory) {
        RedisTemplate&lt;String, Object&gt; template = new RedisTemplate&lt;&gt;();
        RedisSerializer&lt;String&gt; redisSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        template.setConnectionFactory(factory);
        //key序列化方式
        template.setKeySerializer(redisSerializer);
        //value序列化
        template.setValueSerializer(jackson2JsonRedisSerializer);
        //value hashmap序列化
        template.setHashValueSerializer(jackson2JsonRedisSerializer);
        return template;
    }

    @Bean
    public CacheManager cacheManager(RedisConnectionFactory factory) {
        RedisSerializer&lt;String&gt; redisSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        //解决查询缓存转换异常的问题
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        // 配置序列化（解决乱码的问题）,过期时间600秒
        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
                .entryTtl(Duration.ofSeconds(600))
              .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
                .disableCachingNullValues();
        RedisCacheManager cacheManager = RedisCacheManager.builder(factory)
                .cacheDefaults(config)
                .build();
        return cacheManager;
    }
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h2 id="3-Spring-Boot缓存注解"><a href="#3-Spring-Boot缓存注解" class="headerlink" title="3.Spring Boot缓存注解"></a>3.Spring Boot缓存注解</h2><p>在SpringBoot2.x中已经将redis的操作集成到注解中去了，我们只需要在方法上添加特定的注解就可以实现缓存的添加和删除。</p>
<blockquote>
<p>我尼玛哭了，以前都是一个个手敲缓存的逻辑的，现在全给我集成好了是让我当个废物吗😐</p>
</blockquote>
<h3 id="3-1缓存-Cacheable"><a href="#3-1缓存-Cacheable" class="headerlink" title="3.1缓存@Cacheable"></a>3.1缓存@Cacheable</h3><p>根据方法对其返回结果进行缓存，下次请求时，如果缓存存在，则直接读取缓存数据返回；如果缓存不存在，则执行方法，并把返回的结果存入缓存中。一般用在<strong>查询</strong>方法上。</p>
<p>查看源码，属性值如下：</p>
<div class="table-container">
<table>
<thead>
<tr>
<th><strong>属性/方法名</strong></th>
<th><strong>解释</strong></th>
</tr>
</thead>
<tbody>
<tr>
<td>value</td>
<td>缓存名，必填，它指定了你的缓存存放在哪块命名空间</td>
</tr>
<tr>
<td>cacheNames</td>
<td>与 value 差不多，二选一即可</td>
</tr>
<tr>
<td>key</td>
<td>可选属性，可以使用 SpEL 标签自定义缓存的key</td>
</tr>
</tbody>
</table>
</div>
<h3 id="3-2缓存-CachePut"><a href="#3-2缓存-CachePut" class="headerlink" title="3.2缓存@CachePut"></a>3.2缓存@CachePut</h3><p>使用该注解标志的方法，每次都会执行，并将结果存入指定的缓存中。其他方法可以直接从响应的缓存中读取缓存数据，而不需要再去查询数据库。一般用在<strong>新增</strong>方法上。</p>
<p>查看源码，属性值如下：</p>
<div class="table-container">
<table>
<thead>
<tr>
<th><strong>属性/方法名</strong></th>
<th><strong>解释</strong></th>
</tr>
</thead>
<tbody>
<tr>
<td>value</td>
<td>缓存名，必填，它指定了你的缓存存放在哪块命名空间</td>
</tr>
<tr>
<td>cacheNames</td>
<td>与 value 差不多，二选一即可</td>
</tr>
<tr>
<td>key</td>
<td>可选属性，可以使用 SpEL 标签自定义缓存的key</td>
</tr>
</tbody>
</table>
</div>
<h3 id="3-3缓存-CacheEvict"><a href="#3-3缓存-CacheEvict" class="headerlink" title="3.3缓存@CacheEvict"></a>3.3缓存@CacheEvict</h3><p>使用该注解标志的方法，会清空指定的缓存。一般用在<strong>更新或者删除</strong>方法上</p>
<p>查看源码，属性值如下：</p>
<div class="table-container">
<table>
<thead>
<tr>
<th><strong>属性/方法名</strong></th>
<th><strong>解释</strong></th>
</tr>
</thead>
<tbody>
<tr>
<td>value</td>
<td>缓存名，必填，它指定了你的缓存存放在哪块命名空间</td>
</tr>
<tr>
<td>cacheNames</td>
<td>与 value 差不多，二选一即可</td>
</tr>
<tr>
<td>key</td>
<td>可选属性，可以使用 SpEL 标签自定义缓存的key</td>
</tr>
<tr>
<td>allEntries</td>
<td>是否清空所有缓存，默认为 false。如果指定为 true，则方法调用后将立即清空所有的缓存</td>
</tr>
<tr>
<td>beforeInvocation</td>
<td>是否在方法执行前就清空，默认为 false。如果指定为 true，则在方法执行前就会清空缓存</td>
</tr>
</tbody>
</table>
</div>
<p><img src="https://pluto-1300780100.cos.ap-nanjing.myqcloud.com/img/10 首页数据添加redis缓存.png" alt="10 首页数据添加redis缓存"></p>
<h2 id="4-后端添加缓存逻辑"><a href="#4-后端添加缓存逻辑" class="headerlink" title="4.后端添加缓存逻辑"></a>4.后端添加缓存逻辑</h2><p>模块配置文件添加redis配置</p>
<pre class="line-numbers language-properties" data-language="properties"><code class="language-properties">spring.redis.host=127.0.0.1
spring.redis.port=6379
spring.redis.database= 0
spring.redis.timeout=1800000

spring.redis.lettuce.pool.max-active=20
spring.redis.lettuce.pool.max-wait=-1
#最大阻塞等待时间(负数表示没限制)
spring.redis.lettuce.pool.max-idle=5
spring.redis.lettuce.pool.min-idle=0<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>修改接口，在需要添加缓存逻辑的方法上添加对应的注释：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">//获取最新两个首页
@Cacheable(value = "banner",key = "'selectIndexList'")
@GetMapping("getFrontBanner")
public R getFrontBanner(){
    QueryWrapper&lt;CrmBanner&gt; wrapper = new QueryWrapper&lt;&gt;();
    wrapper.orderByDesc("gmt_create");
    wrapper.last("limit 2");
    List&lt;CrmBanner&gt; list = bannerService.list(wrapper);
    return R.ok().data("bannerList",list);
}

@Cacheable(value = "index",key = "'TeacherCourseList'")
//查询前8条热门课程，查询前4条名师
@GetMapping("index")
public R index(){
    //查询前8条热门课程
    QueryWrapper&lt;EduCourse&gt; wrapper = new QueryWrapper&lt;&gt;();
    wrapper.orderByDesc("id");
    wrapper.last("limit 8");
    List&lt;EduCourse&gt; courseList = courseService.list(wrapper);

    //查询前4条名师
    QueryWrapper&lt;EduTeacher&gt; wrapperTeacher = new QueryWrapper&lt;&gt;();
    wrapperTeacher.orderByDesc("id");
    wrapperTeacher.last("limit 4");
    List&lt;EduTeacher&gt; teacherList = teacherService.list(wrapperTeacher);

    return R.ok().data("courseList",courseList).data("teacherList",teacherList);
}

@CacheEvict(value = "banner",allEntries = true)
@ApiOperation(value = "修改Banner")
@PutMapping("update")
public R updateById(@RequestBody CrmBanner banner) {
    bannerService.updateById(banner);
    return R.ok();
}

@CacheEvict(value = "banner",allEntries = true)
@ApiOperation(value = "删除Banner")
@DeleteMapping("remove/{id}")
public R remove(@PathVariable String id) {
    bannerService.removeById(id);
    return R.ok();
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>测试，发现添加了缓存</p>
<p><img src="https://pluto-1300780100.cos.ap-nanjing.myqcloud.com/img/image-20210128133335209.png" alt="image-20210128133335209"></p>
<p>通过源码查看到key生成的规则</p>
<p><img src="https://pluto-1300780100.cos.ap-nanjing.myqcloud.com/img/image-20210128133401945.png" alt="image-20210128133401945"></p>

                
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